(Optional) If you wish to preserve your custom components, stop Bootstrap Studio, and copy bstudio_backup/userPackages to the bstudio folder. This will transfer your components to the new instance.

At this point, you will have a brand new copy of Bootstrap Studio. In most cases this is enough to reset the app to a fresh state. But things like Windows updates can sometimes lead to breakage of the program files themselves, so if things still don't work correctly after the above steps, you will need to also uninstall the app from Add/Remove programs, and install it again.